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Re: 960627: Fortran-90 module for netCDF API

Subject: Re: 960627: Fortran-90 module for netCDF API
Date: Thu, 27 Jun 1996 14:14:54 -0600
>To: address@hidden,
>To: address@hidden
>cc: address@hidden
>From: Robert Pincus <address@hidden>
>Subject: Fortran-90 module for netCDF API
>Organization: Climate and Radiation Branch, NASA Goddard Space Flight Center
>Keywords: 199606271905.AA04392

Hi Robert,

> I am a regular user of the netCDF API to the HDF libraries. I'm also a
> regular user of Fortran-90. To make my life easier, I've encapsulated the
> information found in the "netcdf.inc" file (parameters for the
> Fortran interface) in a Fortran-90 module. This includes the parameter
> definitions as well as interface blocks for the Fortran-callable
> functions (though not the subroutines). I have attached the code to this
> email message. You are welcome to add it to the netCDF and/or HDF
> distributions if you wish. 

Thanks, I'll try to include this with the next update.

I tried defining interface blocks for all the subroutines (see the appended
draft interface block), but discovered this wasn't really possible with the
kind of type-punning we do in the current Fortran interface.  For version 3
of netCDF, we have defined a draft of a new type-safe interface for which
this should no longer be a problem (but the old interface will still be
supported for backwards compatibility).

--Russ

______________________________________________________________________________

Russ Rew                                           UCAR Unidata Program
address@hidden                              http://www.unidata.ucar.edu


! Draft Fortran-90 interface block for the netCDF Fortran interface.
!
! Currently, this just uses type REAL for generic numeric values.  This
! could be fixed to define a different interface name for each numeric
! type, with a generic interface that has the conventional name, but
! then we would have to define extra program units for INTEGER, REAL,
! and DOUBLE PRECISION types, something like:
!
! INTERFACE NCVPT
!   SUBROUTINE NCVPT_INT (NCID,VARID,START,COUNTS,VALUES, rcode)
!     INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
!     INTEGER, INTENT(IN) :: VARID ! variable ID
!     INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
!     INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
!     INTEGER, INTENT(IN) :: VALUES(*) ! real values to be written
!     INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
!   END SUBROUTINE NCVPT
!   SUBROUTINE NCVPT_REAL (NCID,VARID,START,COUNTS,VALUES, rcode)
!     INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
!     INTEGER, INTENT(IN) :: VARID ! variable ID
!     INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
!     INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
!     REAL, INTENT(IN) :: VALUES(*) ! real values to be written
!     INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
!   END SUBROUTINE NCVPT
!   SUBROUTINE NCVPT_DOUBLE (NCID,VARID,START,COUNTS,VALUES, rcode)
!     INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
!     INTEGER, INTENT(IN) :: VARID ! variable ID
!     INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
!     INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
!     DOUBLE, INTENT(IN) :: VALUES(*) ! real values to be written
!     INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
!   END SUBROUTINE NCVPT
! END INTERFACE

INTERFACE       ! Uses type REAL for generic numeric values

    FUNCTION NCCRE (FILENAME, CLOBMODE, rcode)
      INTEGER NCCRE
      CHARACTER (*), INTENT(IN) :: FILENAME ! name of netCDF file
      INTEGER, INTENT(IN) :: CLOBMODE ! either NCCLOB or NCNOCLOB
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCCRE

    FUNCTION NCOPN (FILENAME, RWMODE, rcode)
      INTEGER NCOPN
      CHARACTER(*), INTENT(IN) :: FILENAME
      INTEGER, INTENT(IN) :: RWMODE ! either NCWRITE or NCNOWRIT
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCOPN

    SUBROUTINE NCREDF (NCID, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCREDF

    SUBROUTINE NCENDF (NCID, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCENDF

    SUBROUTINE NCCLOS (NCID, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCCLOS

    SUBROUTINE NCINQ (NCID, ndims,nvars,natts,recdim,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(OUT) :: ndims ! number of dimensions in netCDF
      INTEGER, INTENT(OUT) :: nvars ! number of variables in netCDF
      INTEGER, INTENT(OUT) :: natts ! number of global attributes in netCDF
      INTEGER, INTENT(OUT) :: recdim ! dimension ID of unlimited dimension
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCINQ

    SUBROUTINE NCSNC (NCID, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCSNC

    SUBROUTINE NCABOR (NCID, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCABOR

    FUNCTION NCDDEF (NCID,DIMNAME,SIZE, rcode)
      INTEGER NCDDEF
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      CHARACTER (*), INTENT(IN) :: DIMNAME ! name for dimension
      INTEGER, INTENT(IN) :: SIZE ! size of dimension
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCDDEF

    FUNCTION NCDID (NCID,DIMNAME, rcode)
      INTEGER NCDID
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      CHARACTER (*), INTENT(IN) :: DIMNAME ! name for dimension
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCDID

    SUBROUTINE NCDINQ (NCID,DIMID, dimname,size,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: DIMID ! dimension ID from NCDDEF or NCDID
      CHARACTER (*), INTENT(OUT) :: dimname ! name for dimension
      INTEGER, INTENT(OUT) :: size ! size of dimension
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCDINQ

    SUBROUTINE NCDREN (NCID,DIMID,DIMNAME, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: DIMID ! dimension ID from NCDDEF or NCDID
      CHARACTER (*), INTENT(IN) :: DIMNAME ! new name for dimension
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCDREN

    FUNCTION NCVDEF (NCID,VARNAME,DATATYPE,NVDIMS,VDIMS, rcode)
      INTEGER NCVDEF
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      CHARACTER (*), INTENT(IN) :: VARNAME ! name for variable
      INTEGER, INTENT(IN) :: DATATYPE ! type, one of NCBYTE, ..., NCDOUBLE
      INTEGER, INTENT(IN) :: NVDIMS ! number of dimensions in shape
      INTEGER, INTENT(IN) :: VDIMS(NVDIMS) ! dimension IDs for shape
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCVDEF

    FUNCTION NCVID (NCID,VARNAME, rcode)
      INTEGER NCVID
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      CHARACTER (*), INTENT(IN) :: VARNAME ! name for variable
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCVID

    SUBROUTINE NCVINQ (NCID,VARID, varname,datatype,nvdims,vdims,nvatts,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      CHARACTER (*), INTENT(OUT) :: varname ! name for variable
      INTEGER, INTENT(OUT) :: datatype ! type, one of NCBYTE, ..., NCDOUBLE
      INTEGER, INTENT(OUT) :: nvdims ! number of dimensions in shape
      INTEGER, INTENT(OUT) :: vdims(nvdims) ! dimension IDs for shape
      INTEGER, INTENT(OUT) :: nvatts ! number of attributes
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVINQ

    SUBROUTINE NCVPT1 (NCID,VARID,INDICES,VALUE, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: INDICES(*) ! coordinates of element
      REAL, INTENT(IN) :: VALUE ! real value to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVPT1

    SUBROUTINE NCVP1C (NCID,VARID,INDICES, CHVAL, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: INDICES(*) ! coordinates of element
      CHARACTER, INTENT(IN) :: CHVAL ! character value to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVP1C

    SUBROUTINE NCVGT1 (NCID,VARID,INDICES, value, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: INDICES(*) ! coordinates of element
      REAL, INTENT(OUT) :: value ! real value to be read
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVGT1

    SUBROUTINE NCVG1C (NCID,VARID,INDICES, chval, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: INDICES(*) ! coordinates of element
      CHARACTER, INTENT(OUT) :: chval ! character value to be read
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVG1C

    SUBROUTINE NCVPT (NCID,VARID,START,COUNTS,VALUES, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
      REAL, INTENT(IN) :: VALUES(*) ! real values to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVPT

    SUBROUTINE NCVPTC (NCID,VARID,START,COUNTS,STRING,LENSTR, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
      CHARACTER (*), INTENT(IN) :: STRING ! string value to be written
      INTEGER, INTENT(IN) :: LENSTR ! declared length of string
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVPTC

    SUBROUTINE NCVPTG (NCID,VARID,START,COUNTS,STRIDES,IMAP,VALUES, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
      INTEGER, INTENT(IN) :: STRIDES(*) ! dimensional strides
      INTEGER, INTENT(IN) :: IMAP(*) ! index mapping vector
      REAL, INTENT(IN) :: VALUES(*) ! real values to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVPTG

    SUBROUTINE NCVPGC (NCID,VARID,START,COUNTS,STRIDES,IMAP,STRING,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be written
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be written
      INTEGER, INTENT(IN) :: STRIDES(*) ! dimensional strides
      INTEGER, INTENT(IN) :: IMAP(*) ! index mapping vector
      CHARACTER (*), INTENT(IN) :: STRING ! string value to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVPGC

    SUBROUTINE NCVGT (NCID,VARID,START,COUNTS, values,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be read
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be read
      REAL, INTENT(OUT) :: values ! real values to be read
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVGT

    SUBROUTINE NCVGTC (NCID,VARID,START,COUNTS, string,LENSTR,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be read
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be read
      CHARACTER (*), INTENT(OUT) :: string ! string value to be read
      INTEGER, INTENT(IN) :: LENSTR ! declared length of string
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVGTC

    SUBROUTINE NCVGTG (NCID,VARID,START,COUNTS,STRIDES,IMAP,values,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be read
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be read
      INTEGER, INTENT(IN) :: STRIDES(*) ! dimensional strides
      INTEGER, INTENT(IN) :: IMAP(*) ! index mapping vector
      REAL, INTENT(OUT) :: values ! real values to be read
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVGTG

    SUBROUTINE NCVGGC (NCID,VARID,START,COUNTS,STRIDES,IMAP,string,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      INTEGER, INTENT(IN) :: START(*) ! corner of array of values to be read
      INTEGER, INTENT(IN) :: COUNTS(*) ! edges of array of values to be read
      INTEGER, INTENT(IN) :: STRIDES(*) ! dimensional strides
      INTEGER, INTENT(IN) :: IMAP(*) ! index mapping vector
      CHARACTER (*), INTENT(OUT) :: string ! string value to be read
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVGGC

    SUBROUTINE NCVREN (NCID,VARID,VARNAME, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID
      CHARACTER (*), INTENT(IN) :: VARNAME ! name for variable
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCVREN

    SUBROUTINE NCAPT (NCID,VARID,ATTNAME,DATATYPE,ATTLEN,VALUES, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      INTEGER, INTENT(IN) :: DATATYPE ! type, one of NCBYTE, ..., NCDOUBLE
      INTEGER, INTENT(IN) :: ATTLEN ! number of attribute values
      REAL, INTENT(IN) :: VALUES(*) ! real values to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCAPT

    SUBROUTINE NCAPTC (NCID,VARID,ATTNAME,DATATYPE,LENSTR,STRING, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      INTEGER, INTENT(IN) :: DATATYPE ! type, one of NCBYTE, ..., NCDOUBLE
      INTEGER, INTENT(IN) :: LENSTR ! declared length of string
      CHARACTER (*), INTENT(IN) :: STRING ! string value to be written
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCAPTC

    SUBROUTINE NCAINQ (NCID,VARID,ATTNAME, datatype,attlen,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      INTEGER, INTENT(OUT) :: datatype ! type, one of NCBYTE, ..., NCDOUBLE
      INTEGER, INTENT(OUT) :: attlen ! number of attribute values
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCAINQ

    SUBROUTINE NCAGT (NCID,VARID,ATTNAME, values,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      REAL, INTENT(OUT) :: values ! real values to be read
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCAGT

    SUBROUTINE NCAGTC (NCID,VARID,ATTNAME, string,LENSTR,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      CHARACTER (*), INTENT(OUT) :: string ! string value to be read
      INTEGER, INTENT(IN) :: LENSTR ! declared length of string
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCAGTC

    SUBROUTINE NCACPY (INNCID,INVARID,ATTNAME,OUTNCID,OUTVARID, rcode)
      INTEGER, INTENT(IN) :: INNCID ! input netCDF ID
      INTEGER, INTENT(IN) :: INVARID ! input variable ID
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      INTEGER, INTENT(IN) :: OUTNCID ! output netCDF ID
      INTEGER, INTENT(IN) :: OUTVARID ! output variable ID
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCACPY

    SUBROUTINE NCANAM (NCID,VARID,ATTNUM, attname,rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      INTEGER, INTENT(IN) :: ATTNUM ! attribute number
      CHARACTER (*), INTENT(OUT) :: attname ! attribute name
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCANAM

    SUBROUTINE NCAREN (NCID,VARID,ATTNAME,NEWNAME, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      CHARACTER (*), INTENT(IN) :: NEWNAME ! new attribute name
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCAREN

    SUBROUTINE NCADEL (NCID,VARID,ATTNAME, rcode)
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: VARID ! variable ID or NCGLOBAL
      CHARACTER (*), INTENT(IN) :: ATTNAME ! attribute name
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END SUBROUTINE NCADEL

    FUNCTION NCTLEN (DATATYPE, rcode)
      INTEGER NCTLEN
      INTEGER, INTENT(IN) :: DATATYPE ! type, one of NCBYTE, ..., NCDOUBLE
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCTLEN

    SUBROUTINE NCPOPT (NCOPTS)
      INTEGER, INTENT(IN) :: NCOPTS ! error-handling option flag
    END SUBROUTINE NCPOPT

    SUBROUTINE NCGOPT (ncopts)
      INTEGER, INTENT(OUT) :: ncopts ! error-handling option flag
    END SUBROUTINE NCGOPT

    FUNCTION NCSFIL (NCID,FILLMODE, rcode)
      INTEGER NCSFIL
      INTEGER, INTENT(IN) :: NCID ! netCDF ID, returned by NCCRE or NCOPN
      INTEGER, INTENT(IN) :: FILLMODE ! NCNOFILL or NCFILL
      INTEGER, INTENT(OUT) :: rcode ! returned error code, 0 if no errors
    END FUNCTION NCSFIL

END INTERFACE
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